Some of the REBELS sources show large spatial offsets between the observed ultraviolet and infrared emission – up to 1.5 arcsec (or 7.6 kpc; [1]}). Similar offsets have also been observed in high-resolution observations of star-forming galaxies at lower redshifts (e.g., [2]}, [3]}). These offsets could be a result of the multi-phase ISM – dust and stars are not homogeneously distributed, with opaque star-forming clumps and a more transparent diffuse component. This could be a challenge for SED fitting methods that assume energy balance (e.g., [4]}), as well as for modelling the IRX-\(\beta \)  relation [5]}. More high-resolution follow-up of the dust (with ALMA) and stellar (with JWST) emissions in these sources will be key to better understand these offsets.
